JS determines whether the selected time (or current time) is in a time period of the implementation code _ date

Core code:

var time_range = function (BeginTime, Endtime, nowtime) {
  var strb = Begintime.split (":");
  if (strb.length!= 2) {return
    false;
  }

  var stre = Endtime.split (":");
  if (stre.length!= 2) {return
    false;
  }

  var strn = Nowtime.split (":");
  if (stre.length!= 2) {return
    false;
  }
  var B = new Date ();
  var e = new Date ();
  var n = new Date ();

  B.sethours (Strb[0]);
  B.setminutes (strb[1]);
  E.sethours (Stre[0]);
  E.setminutes (stre[1]);
  N.sethours (Strn[0]);
  N.setminutes (strn[1]);

  if (N.gettime ()-b.gettime () > 0 && n.gettime ()-e.gettime () < 0) {return
    true;
  } else {
   alert ("Current time is:" + n.gethours () + ":" + n.getminutes () + ", not within that time range!" ");
    return false;
  }
}
Time_range ("21:30", "23:30", "3:22");

Effect:

In the case of the current time:

 var Time_range = function (BeginTime, endtime) {var strb = Begintime.split (":");
  if (strb.length!= 2) {return false;
  var stre = Endtime.split (":");
  if (stre.length!= 2) {return false;
  var B = new Date ();
  var e = new Date ();

  var n = new Date ();
  B.sethours (Strb[0]);
  B.setminutes (strb[1]);
  E.sethours (Stre[0]);

  E.setminutes (stre[1]);
  if (N.gettime ()-b.gettime () > 0 && n.gettime ()-e.gettime () < 0) {return true; else {alert ("Current time is:" + n.gethours () + ":" + n.getminutes () + ", not within that time range!
    ");
  return false; 
} time_range ("21:30", "23:30");